Utilization of cellulosic films, sheets, and the like



J. M. DRIVER June 29, 1937.

UTILIZATION OF CELLULOSIC FILMS, SHEETS, AND THE LIKE Original Filed March 22, 1933 IN V EN TOR.

Patented June 29, I937 PATENT oFFica 2,085,301 UTILIZATION OF CELLULOSIG FIIMS,

SHEETS,

ANDTHELIKE .Uohn M. Driver, New York, N. Y.

662,178. 1935, Serial No.

1 Claim.

This application is a division of my co-pending application Serial No. 662,178, filed March 22, 1933, Patent No. 2,004,041, June 4, 1935.

My invention relates to the utilization'of various forms of sheet material, films, pellicles, or thelike, made from cellulosic bodies, particularly those types of cellulosic films or pellicles of which cellophane is a notable and important example, in the manufacture of bags and similar containers.

In the formation of bags or containers with bellows-folded sides, one end of the same is folded over and pasted down against one wall to form the bottom or end closure. It is known to apply an adhesive to the inner wall surface of the blank subsequently developed into such bag or container in order that the part folded over shall be internally connected sothat a properbottom or end closure may be produced. In such end closing operation, however, the bellows-folded side portions are not connected and it becomes desirable to insure their connection by adhesive suitably applied. It has been proposed to aperture one wall portion of a. web before the same is folded so that in the final folding such apertured portion will occupy a position with respect to a line of paste or adhesive, which may enter such apertures and insure the proper securing of the bellows-folded side portions of such bag or other container. In all instances, however, these apertures, openings, cuts, and the like, have been produced by sharp edged instruments which are designed to cut through and remove portions of the web which portions must be subsequently disposed of in order to avoid clogging the machine or becoming associated with pasted seams and the like.

These and other features of my invention are more fully referred to hereinafter, and for a better understanding of the same, reference is made to the accompanying drawing, in which the development of my present invention is brought out, and in which:

Fig. 1 represents a portion of a web or sheet of cellophane apertured or perforated in accordance with one part of my invention and available for use in the manufacture of bags with bellows-folded sides.

Fig. 2 is a fragmentary view illustrating one i form of perforating or aperturing means.

ing the rounded edge of the aperture, taken on the line IV-IV, Fig. 3.

Fig. 5 is a perspective view of a bag bottom or closure, and 3 Fig. 6 is a plan view of a fragmentary portion of the bottom of a bag in its secured together condition.

As above noted, these transparent, cellulosic bodies, of which the commercial cellophane V is perhaps the best known example, are of a 10 nature that may be said to dissolve under the action of heat. I utilize this characteristic in carrying my invention into effect.

In Fig. 1, I have shown a portion of a web or sheet of cellulosic material, which may be cellophane", apertured for a particular purpose. In Fig. 2, I show "means whereby these apertures may be effected. In such figure, A represents a roll over which the web of transparent cellulosic .materialfor instance the "cellophane of commerce-masses, and this roll is provided with annular grooves a. which may be equidistant and occupy such position with reference to the web of material as the nature of the container or bag to be made therefrom will require. Cooperating with the grooved roll are a series of piercing needles or pins b carried by a roll B; such needles or pins being adjustable in such roll, and the roll being adjustable toward and from the roll A over which the cellulosic material passes so that the longitudinal spacing between the apertures of the respective groups may be changed when desired; depending upon the size of bags to be made, inasmuch as the apertures always occupy a definite position relatively to that portion of the blank which subsequently becomes the closed end of the bag or other container. These needles or pins are heated to an extent sufiicient to melt the cellophane or other cellulosic film or web as they'enter the same 40 in order that the aperture or perforation so made will have a clean and closely sealed edge. These apertures are intended for the passageof a portion of the adhesive in order that such adhesive may engage the wall behind the same which, in the formation of such end closures, is the inner wall of .the folded portion, thereby providing a folded end closure in which all of the foldedover portion is firmly attached 'to one wall of the The heated perforating pins or needles employed for forming the apertures c are relatively smallso that the dissolving effected by such pins or needles practically consumes the material; rounding the edge of the aperture as indicated at 66 and no waste isproduced. Hence, there is no necessity for providing means for gathering material hitherto removed from the web in the formation of these apertures.

Having thus described this invention, what I claim and desire to secure by Letters Patent is:

As an article of manufacture, a bag of cellulosic material-cellophane and the. like-having bellows-folded sides; said bag having a bottom formed by folding an end of the blank from which such bag is made and securing such folded end to one outer flat portion of said blank, and means for connecting together the bellows-folded portions at the corners of the bag closure comprising apertures in the bellows folds; and adhesive securing said bellows-folded portions together through said apertures.

' JOHN M. DRIVER. 

